package cn.tedu.ivos.application.service.impl;

import cn.tedu.ivos.application.mapper.ApplicationMapper;
import cn.tedu.ivos.application.pojo.dto.ApplicationQuery;
import cn.tedu.ivos.application.pojo.dto.ApplicationSaveParam;
import cn.tedu.ivos.application.pojo.entity.Application;
import cn.tedu.ivos.application.pojo.vo.ApplicationVO;
import cn.tedu.ivos.application.service.ApplicationService;
import cn.tedu.ivos.audit.mapper.AuditMapper;
import cn.tedu.ivos.audit.pojo.vo.AuditVO;
import cn.tedu.ivos.audit.service.AuditService;
import cn.tedu.ivos.base.enums.ApplicationStatusEnum;
import cn.tedu.ivos.user.mapper.UserMapper;
import cn.tedu.ivos.user.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.StringJoiner;

/* @Transactional是Spring提供的一个用于管理事务的注解,用来管理类或方法上的事务行为
在对数据库做操作时,可以确保方法中的所有数据库操作都在同一个事务中执行,要么都成功,要么都失败 */
@Transactional
@Slf4j
@Service
public class ApplicationServiceImpl implements ApplicationService {
    @Autowired
    ApplicationMapper applicationMapper;
    @Autowired
    AuditService auditService;
    @Autowired
    UserMapper userMapper;
    @Autowired
    AuditMapper auditMapper;

    @Override
    public void save(ApplicationSaveParam applicationSaveParam) {
        log.debug("保存申请单业务:{}", applicationSaveParam);
        Application application = new Application();
        BeanUtils.copyProperties(applicationSaveParam, application);
        application.setStatus(ApplicationStatusEnum.PENGDING.getCode());
        application.setCreateTime(new Date());
        /* 遇到的问题:新增申请单对应的审批单时,审批单数据没有此申请单id
        原因:执行insert方法的SQL时,并没有把刚刚生成的申请单id回填到application对象中
        解决办法:给此SQL上加useGeneratedKeys="true" keyProperty="id"属性
        效果:JDBC自动回填此申请单id到application对象的id属性中,再传给审批,审批就拿到申请单id了*/
        applicationMapper.insert(application);

        //需要在创建申请单后,为此申请单创建对应的审批单
        auditService.insertAudit(application);
    }

    @Override
    public List<ApplicationVO> selectApplication(ApplicationQuery applicationQuery) {
        List<ApplicationVO> list = applicationMapper.selectApplication(applicationQuery);
        //遍历申请单VO集合,获取每一个申请单VO,为它补全审批人数据
        for (int i = 0; i < list.size(); i++) {
            ApplicationVO applicationVO = list.get(i);
            //定义一个自定义方法,为当前传入的applicationVO补全数据
            assignAuditUserList(applicationVO);
        }
        return list;
    }

    @Override
    public void cancel(Long id) {
        log.debug("撤销申请单业务:{}",id);
        Application application = new Application();
        application.setId(id);
        application.setStatus(ApplicationStatusEnum.CANCEL.getCode());
        application.setUpdateTime(new Date());
        applicationMapper.update(application);
        //还需要删除此申请单对应的所有审批单
        auditMapper.deleteByApplicationId(id);
    }

    private void assignAuditUserList(ApplicationVO applicationVO) {
        //1.准备空集合,分别用来保存当前申请单对应的审批人id与姓名
        List<Long> auditUserIdList = new ArrayList<>();
        List<String> auditUsernameList = new ArrayList<>();
        //2.根据当前传入的申请单id,查询此申请单对应的所有审批单
        List<AuditVO> auditVOList = auditService.selectAuditByApplicationId(applicationVO.getId());
        //3.遍历得到每一个审批单
        for(int i = 0; i < auditVOList.size(); i++){
            AuditVO auditVO = auditVOList.get(i);
            //4.取出当前审批单中的审批人id存入空集合中
            Long id = auditVO.getAuditUserId();
            auditUserIdList.add(id);
            //5.根据审批人id,查询此人姓名
            UserVO userVO = userMapper.selectById(id);
            auditUsernameList.add(userVO.getUsername());
        }
        //6.准备一个拼接工具
        StringJoiner stringJoiner = new StringJoiner(",");
        for (String username : auditUsernameList){
            stringJoiner.add(username);
        }
        //7.给传入的申请单VO补全数据
        applicationVO.setAuditUserIdList(auditUserIdList);
        applicationVO.setAuditUsernameList(stringJoiner.toString());
    }
}
